Gihon is mentioned in Genesis as the name of a river that encompasses the whole land of Ethiopia. The answer that Jack said:
'Gihon' is a Hebrew word that means 'to burst forth' or 'to gush'. It was that name of the spring that supplied water to the tabernacle and temple complex that Solomon later built. 2 Chronicles 32 records how Hezekiah took counsel to contain and reroute this water supply so that the invading king of Assyria could not use it. You can walk through that tunnel today, and today that tunnel is within the borders of the modern city of Jerusalem"
is not the right answer because this argument "the spring that supplied water to the tabernacle and temple complex that Solomon later built. 2 Chronicles 32 records how Hezekiah took counsel to contain and reroute this water supply so that the invading king of Assyria could not use it" was mentioned after King Solomon's coronation. Solomon himself built it and named it after Gihon. Even the sense of the chapter, contextually, tells that it was a long journey down to Gihon, not to a nearby city. In addition, David was the king of Jerusalem, but Solomon was coronated in front of the King of Gihon who was that king? How could there be two kings?